Saturday, April 4, 2015

Answer to Case 344

Answer: Earthworm, a segmented worm in the Annelida phylum. As Hans pointed out, it has rings around its body and a "saddle" (clitellum) which is a sac in which eggs are deposited.

Thank you to Florida Fan for sharing your earthworm story. Another reader also wrote in with a comment on how often earthworms are submitted to the laboratory. It's true! We get an earthworm submitted to our laboratory about once per week in the spring and summer months; (granted, we are a large reference lab and smaller labs probably don't see as many).

We've had several examples of annelids on this blog before:

Case 234 shows what an earthworm looks like on histologic sections (although sending intact worms to the microbiology lab is always preferred to sectioning them!)

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Every week I will post a new Case, along with the answer to the previous case. Please feel free to write in with your answers, comments, and questions. Also check out my image archive website at http://parasitewonders.com. Enjoy!

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